Cholomyzon multisetum, Uyeno & Johnsson, 2018
publication ID |
https://doi.org/ 10.1080/00222933.2018.1541199 |
publication LSID |
lsid:zoobank.org:pub:7C8DED0A-9CEB-405D-9BBF-FAF2043B0858 |
persistent identifier |
https://treatment.plazi.org/id/5CB2DCB2-4750-4FB7-ACD6-E0962A0E61BC |
taxon LSID |
lsid:zoobank.org:act:5CB2DCB2-4750-4FB7-ACD6-E0962A0E61BC |
treatment provided by |
Felipe |
scientific name |
Cholomyzon multisetum |
status |
sp. nov. |
Cholomyzon multisetum sp. nov.
( Figures 1 View Figure 1 , 2 View Figure 2 )
Type material
Holotype adult female (NSMT-Cr 25851), ex Tubastraea coccinea Lesson, 1829 (Hexacorallia: Scleractinia : Dendrophylliidae ), in Nishinohama Port (29°59 ʹ N, 129°54 ʹ E), Kuchino-shima Island, Tokara Islands, Japan, 2 m depth, 28 August 2015, leg. D. Uyeno. Paratype: 1 adult female (NSMT-Cr 25852), sampling data same as holotype.
Description of adult female
Body ( Figure 1 View Figure 1 (a)) 896 long. Prosome 637 long, comprising cephalothorax and three free thoracic somites. Cephalothorax ( Figure 1 View Figure 1 (a)) round, wider than long, 518 × 593, flattened dorsoventrally, with pair of protruded posterolateral corner. Second to fourth pedigerous somites ( Figure 1 View Figure 1 (a)) wider than long; fourth pedigerous somite bearing pair of round posterolateral lobes with median notch ( Figure 1 View Figure 1 (c)). Urosome comprising fifth pedigerous somite, genital double somite and abdominal somites. Genital double somite ( Figure 1 View Figure 1 (a)) wider than long, 113 × 176. Abdomen composed of two free post genital somites, 77 × 95 and 70 × 68, respectively. Caudal ramus ( Figure 1 View Figure 1 (b)) 0.80 times long than wide, 18 × 23, with six setae.
Rostral area with round margin without apex. Antennule ( Figure 1 View Figure 1 (d)) 11-segmented, armature formula 1 + 1 aesthetasc, 1 + 1 aesthetasc, 11 + 1 aesthetasc, 3 + 1 aesthetasc, 4 + 1 aesthetasc, 1 + 1 aesthetasc, 2 + 1 aesthetasc, 3, 2, 3, and 7 + 1 aesthetasc; all setae naked. Antenna ( Figure 1 View Figure 1 (e)) composed of coxa, basis, and 2-segmented endopod; coxa unarmed; basis bearing row of hairs; proximal endopodal segment bearing row of spinules and distal segment with terminal slightly curved claw. Mandible ( Figure 1 View Figure 1 (f)) biramous; elongate stylet bearing 13 teeth on distal tip ( Figure 1 View Figure 1 (g)); slender 1-segmented palp bearing long seta with row of fine spinules on inner margin. Oral cone ( Figure 1 View Figure 1 (a)) conical. Maxillule ( Figure 1 View Figure 1 (h)) bilobed with inner lobe (endite) bearing four distal setae and row of spinules and outer lobe (palp) bearing three setae. Maxilla ( Figure 2 View Figure 2 (a)) composed of syncoxa and claw; syncoxa robust, unarmed; claw proximally robust, slender and elongate after patch of hair medially located, row of spinules posteriorly. Maxilliped ( Figure 2 View Figure 2 (b)) subchelate, comprising syncoxa, basis, and unsegmented endopod bearing single median and distal elements and claw.
Legs 1 to 3 ( Figure 2 View Figure 2 (c–e)) biramous; both rami bearing 3-segmented rami. Leg armature formula as follows:
Intercoxal sclerites ( Figure 2 View Figure 2 (c–e)) of legs 1 to 3 unarmed. All spines bearing serrated margins. Basis of leg 1 bearing row of spinules on base of thick seta and inner protrusion. Both rami of legs 1 to 3 bearing rows of spinules on outer margins. Leg 1 ( Figure 2 View Figure 2 (c)) bearing distal pointed process on outer margin of second and third endopodal segments. Legs 2 and 3 ( Figure 2 View Figure 2 (d,e)) bearing pointed process on outer margins of all exopodal and second and third endopodal segments. Third endopodal segments of legs 1 to 3 ( Figure 2 View Figure 2 (c–e)) bearing medial pointed processes on position of outer seta. Leg 4 absent. Leg 5 ( Figure 2 View Figure 2 (f)) represented by constricted protrusion with two setae. Leg 6 ( Figure 1 View Figure 1 (c)) represented by two protrusions with distal seta.
Variability
The morphology of the female paratype as in the holotype. The measurements of the body parts (n = 1) are as follows: body length 847; cephalothorax length 487; cephalothorax width 574; prosome length 620; genital double somite length 112; genital double somite width 150; first urosomite length 77; first urosomite width 103; anal somite length 63; anal somite width 72; caudal ramus length 15; caudal ramus width 23. Caudal ramus 0.66 times longer than wide.
Remarks
Cholomyzon multisetum sp. nov. differs from C. brevisetigerum Humes, 1997 and C. tubastraeae by the following: third, fourth and fifth segment of the antennule of the female bearing 11, three, and four setae, respectively (vs. seven, two, and two setae); the maxillule bearing the outer lobe with four setae (vs. three setae); distal endopodal segments of legs 2 and 3 bearing five and two elements, respectively (vs. six and three elements, respectively) (see Humes 1997b; Cheng et al. 2011). The new species is also differentiated from C. palpiferum Stock and Humes, 1969 by the following characters: absence of leg 4 (vs. represented by thumb-shaped process with two setae); distal endopodal segments of legs 2 and 3 bearing five and two elements, respectively (vs. six and three elements) (see Stock and Humes 1969).
Etymology
The specific name of the new species ‘ multisetum ’ refers to the antennule of the new species bearing more setae than congeners.
Newly established Japanese name
‘Iboyagi-gakure-kudakuchi-mijinko-ka’ for the family, ‘Iboyagi-gakure-kudakuchi-mijinkozoku’ for the genus, and ‘Iboyagi-gakure-kudakuchi-mijinko’ for the species.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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