Heterozosime, Kim & Lee, 2021

Genus Heterozosime gen. nov.

urn:lsid:zoobank.org:act:7E707DCE-5BF1-45F8-8442-C700C3C5B83A

Type species

Heterozosime tenuis gen. et sp. nov., by monotypy.

Diagnosis

Body subcylindrical, with inconspicuous distinction between prosome and urosome; urosomites except penultimate and anal somites with pleural extensions; genital somite and first abdominal somite fused ventrally in female, forming genital double-somite. Penultimate somite with pseudoperculum comprising several projections. Rostrum undefined at base, with 1 pair of long sensilla distally, ornamented with lateral setules. Caudal rami elongate, longer than length of anal somite. Antennule robust, 6-segmented, with ae on second and distal segments, respectively. Antennary exopod 3-segmented; setal armature, from proximal: 1.1.4. Mandibular palp well-developed, with 3 setae on basis; exopod 1-segmented, with 3 setae; endopod 1-segmented, with 4 setae. Maxillular coxa with epipodite represented by 1 seta; exopod 1-segmented, with 3 setae; endopod 1-segmented, with 6 setae. Maxillary syncoxa with 3 endites; endopod 2-segmented. Maxilliped stenopodial, with 1 stout element on basis distally; endopod small, 1-segmented, with 4 setae. P1 with 2-segmented exopod and endopod, P2–P4 with 3-segmented exopod and endopod; exp-3 with 2 outer spines. Female P5 exopod fused to baseoendopod basally, with deep incision between exopod and endopodal lobe; exopod with 3 marginal setae and 1 surface seta. P6 represented by 3 setae.

Male

Urosome 6-segmented; pleural extensions less developed. Antennule subchirocer, 8-segmented, with ae on sixth and distal segments, respectively. P2 endopod 2-segmented; enp-2 with 1 inner plumose seta, 1 plumose distal seta and 1 small outer apophysis. P5 fused with somite basally; endopodal lobe rudimentary, with 2 small setae. Left and right P6 symmetrical, each with 2 lobes, the outer one with 1 stout spine and the inner one with 1 stout spine and 1 slender seta.

Etymology

The generic name is a combination of the Greek ‘ heteros ’ (‘different’) and the name of the type genus Zosime . This reflects the close relationship with Zosime , but recognizes the significant difference in the P1 exopod segmentation.