Fig 18 - uploaded by Il-Hoi Kim
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Asterocheres simulans (T. Scott), male. A, urosome except for fifth pedigerous somite, ventral; B, antennule; C, proximal part of maxilliped; D, leg 1 endopod; E, leg 5 exopod. Scale bars: AD, 0.05 mm; E, 0.02 mm.
Source publication
Twelve species of siphonostomatoid copepods mainly associated with marine invertebrates are recorded from Korean waters. Nine species are new to science: Arctopontius minutus n. sp., A. adelphus n. sp, and Dyspontius alatus n. sp. in the family Artotrogidae; Asterocheres horridus n. sp., A. cuspis n. sp., A. quadridens n. sp., Scottocheres mipoensi...
Contexts in source publication
Context 1
... A. nudicoxus known from Madagascar, the oral cone is very broad, the exopod of leg 5 is elongate, more than 6 times as long as wide in the female, the posteroventral margins of the genital doublesomite and abdominal so mites are crenate (Kim, 2010) Asterocheres simulans (T. Scott, 1898) (Figs. 16-18 (Fig. 17C). ...
Context 2
... as long as wide, and armed with 2 distal and 1 subdistal setae; lateral margins of exopod slightly convex and spinulose; 2 distal setae broadened proximally, plumose, 61 and 46 μm long, respectively; subdistal seta naked, 41 μm long. Leg 6 represented by 2 small setae on genital operculum (Fig. 17G). Male. Urosome 5segmented. Genital somite (Fig. 18A) 128 × 164 μm, wider than long, with few spinules on lateral margin. First to third abdominal somites 26 × 60, 19 × 53, and 26 × 50 μm, respectively. Caudal ramus 16 × 23 μm, 1.45 times as wide as ...
Context 3
... as in female. Antennule (Fig. 18B) 368 μm long, 18segmented, and geniculate between sixteenth and seventeenth segments; armature formula: 2, 2, 2, 2, 2 / 2, 2, 2, 6, 2 / 2, 2, 2, 2, 2 / 4, 2 + aesthetasc, and 11; aesthetasc on penultimate segment relatively small, but extending over distal tip of terminal segment. Antenna as in female. Oral cone, mandible, maxillule, ...
Context 4
... 2 / 2, 2, 2, 6, 2 / 2, 2, 2, 2, 2 / 4, 2 + aesthetasc, and 11; aesthetasc on penultimate segment relatively small, but extending over distal tip of terminal segment. Antenna as in female. Oral cone, mandible, maxillule, and maxilla as in fe male. Maxilliped similar to that of female, but its basis with prominent proximal process on inner margin (Fig. ...
Context 5
... 1 slightly different from that of female in having more acutely pointed outer and inner distal processes on third endopodal segment (Fig. 18D). Legs 24 as in fe ...
Context 6
... 5 exopod (Fig. 18E) rectangular, 2.89 times as long as wide, with parallel lateral margins. Leg 6 repre sented by 2 distal plumose setae on genital operculum (Fig. 18A). Remarks. Ivanenko (1997) redescribed this species, based on the specimens from the White Sea. A careful comparison of Korean specimens with Ivanenko's illus trations resulted in that ...
Context 7
... 5 exopod (Fig. 18E) rectangular, 2.89 times as long as wide, with parallel lateral margins. Leg 6 repre sented by 2 distal plumose setae on genital operculum (Fig. 18A). Remarks. Ivanenko (1997) redescribed this species, based on the specimens from the White Sea. A careful comparison of Korean specimens with Ivanenko's illus trations resulted in that the forms from the two different zoogeographic regions revealed no significant differences. The length combinations of setae on the lobes of the ...
Citations
... Kuayguara gen. nov. shares the uniramous leg 4 with a 3-segmented exopod with the 7 genera included in the third group, but these taxa can be easily differentiated by the level of reduction patterns found on their leg 1: Ascidipontius, Chejupontius, Cryptopontius, Dyspontius, and Pulicitrogus exhibit a biramous 3-segmented leg 1, with the exopod formula: (I-0, 0-0; II, 3), (I-0; 0-1; II, I, 2 or II, I, 1), (I-1; I-1; III, 4 or III, 5), (I-1; I-1 or 0-1; II, 5 or II,4), (I-0; 0-1; II, 3), respectively, characterizing minor modifications in the pattern, showing only a few elemental reductions (Thorell 1859;Giesbrecht 1899;Sars 1918;Kim 1996Kim 1998Kim 2016Johnsson 2001;Farias et al. 2021;Lee and Kim 2023). This is completely different from Kuayguara gen. ...
Artotrogidae Brady, 1880 is a cosmopolitan family with 23 valid genera and 131 known species. However, a considerable number of these species were subject of reexaminations and redescriptions recently. With the crescent number of new species discovered, it is becoming possible to better understand their boundaries. This study presents a new genus and species of Artotrogidae, recovered from unidentified hosts in debris of benthonic samples from Todos-os-Santos Bay, northeastern coast of Brazil. Kuayguara etymatee gen. et sp. nov. exhibits an underdeveloped first leg, which possess an unsegmented protopod and 1-segmented exopod, a unique set of morphological characteristics that differentiates it from all other genera of the family.
... After more than a century, a total of eight species have been described: S. elongatus (Scott T and Scott A, 1894), S. longifurca Giesbrecht, 1897, S. stylifer Giesbrecht, 1902, S. gracilis Hansen, 1923S. latus Nicholls, 1944, S. laubieri Stock, 1967, S. stocki Malt, 1991, S. youngi Johnsson, 2002 and Scottocheres mipoensis Kim, 2016. As a consequence of these new species, some of the defining characteristics have been slightly modified. ...
... The species of Scottocheres form three groups according to antennule segmentation. The first one includes Scottocheres longifurca, S stylifer, S. mipoensis, and S. youngi with an 18-segmented antennule; the second includes S. latus and S. stocki with a 19-segmented antennule (Giesbrecht, 1897(Giesbrecht, , 1902Johnsson, 2002;Kim, 2016;Malt, 1991;Nicholls, 1944). The new species plus S. elongatus, S. gracilis, and S. laubieri form the third group with a 17-segmented antennule. ...
The siphonostomatoid copepod genus Scottocheres was established by Giesbrecht in 1897 and now includes nine species. Consequently, these new species introduced new characteristics that must be considered to define the genus. This study provides an emended diagnosis of the genus, describes a new species, discusses the geographic distribution and hosts of the genus, and includes a key to the species. The new species was found associated with the sponge Callyspongia in Todos-os-Santos Bay and can be distinguished from its congeners by a set of characters that includes the presence of a unique seta on the inner margin of the second endopodal segment of legs 1 to 4 and only two spines on the outer margin of third endopodal element of leg 1.
... Antennule segmentation patterns are built based on model proposed by Huys & Boxshall (1994). The number of setae and key segments such as the one with the aesthetasc provide the cues to trace the homologies and becomes strong characters used in diagnosis of genera and families, not only in Entomolepididae (Kim 2004, McKinnon 1988) but also in other families such as Asterocheridae (Conradi & Bandera 2011, Kim 2013 and Artotrogidae (Eiselt 1965, Kim 2016. ...
The Entomolepididae family is a small taxon with a very characteristic body morphology and is represented, in the Atlantic Ocean, by three genera and five species. A recent study in Todos-os-Santos Bay, in Bahia State, has revealed a new species of Spongiopsyllus and a new species and genus belonging to the Entomolepididae. The new species of Spongiopsyllus is found in association with the sponge Aplysina cauliformis (Carter, 1882) sampled at the Porto da Barra beach. It is distinguished from its congeners mainly by differences in the segmentation pattern of the antennule, endopod of antenna, and the setation of the maxillule, maxilla and maxilliped. The new genus and species from Parmulodinae Eiselt, 1959 is found in association with the sponge Aplysina solangeae Pinheiro, Hajdu & Custódio, 2007, sampled at the Yacht Club Beach. The genus differs from others Parmulodinae mainly due to segmentation pattern of the antennule, endopod of antenna, maxilliped and swimming legs.
Two new genera and four new species of siphonostomatoid copepods of the family Asterocheridae associated with sponges are described from the Korean East Sea (Sea of Japan). These new copepods are distinguishable from related genera and species by their diagnostic morphological characters as follows: Amalomyzon elongatum n. gen. n. sp. bears an elongated body, two-segmented rami of legs 2, a uniramous leg 3 with two-segmented exopod, and a rudimentary leg 4 represented by a lobe. Dokdocheres rotundus n. gen. n. sp. has an 18-segmented female antennule, a two-segmented endopod of antenna, and unusual setations of swimming legs, including three spines plus four setae on the third exopodal segment of legs 2–4. Asterocheres banderaae n. sp. has no inner coxal seta on leg 1 or 4, but has two strong, sexually dimorphic inner spines on the second endopodal segment of male leg 3. Scottocheres nesobius n. sp. bears elongate female caudal rami about six times longer than wide, a 17-segmented female antennule, and two spines plus four setae on the third exopodal segment of leg 1.
A new species of the diverse and widely distributed symbiotic copepod genus Asterocheres is described from the sea star Nidorellia armata (Gray, 1840) in Mexican waters of the Eastern Tropical Pacific. The new species resembles various other congeners by sharing several characters including: (1) a siphon extending to the intersection of the maxilliped, (2) a 21-segmented antennule, and (3) a 2-segmented mandible palp. It can be distinguished by the unique structure and ornamentation of the maxilla, the armature and proportions of the fifth leg, and its body shape.
This is the first documented record of Asterocheres from the Mexican Pacific and the first finding of a symbiotic copepod on this sea star host. Males, ovigerous females and copepodites were recorded from the host, thus suggesting a well-established symbiotic association. It is likely that copepods feed on the host’s tegument. Further studies will be needed to assess the reproductive traits and seasonality of this copepod as a symbiont.
