Undulacandona andromeda, Karanovic & Cho, 2017

UNDULACANDONA ANDROMEDA SP. NOV.

( FIGS 9, 10)

h t t p:/ / z o o b a n k. o r g / u r n:l s i d: z o o b a n k. o r g: a c t: D14C8179-2683-43DA-9768-D17D748D8396

H o l o t y p e: F e m a l e, d i s s e c t e d o n o n e s l i d e (N I B R I V 0 0 0 0 2 4 3 2 8 9), s h e l l o n S E M s t u b (NIBRIV0000243282).

Paratypes: Female, soft parts used for DNA extraction, shell on micropalaeontological slide ( NIBRIV0000243290 ), juvenile female, soft parts used for DNA extraction, shell on micropalaeontological slide ( NIBRIV0000243291 ), five females in alcohol L7 ( Fig. 8H): Five-segmented. Penultimate segment incompletely subdivided. Basal segment with all three setae present. Only seta ‘g’ present. Terminal segment with two short and one long seta. L ratio between two short setae equalling 2:1 .

UR ( Fig.8I): Ramus short, posterior setae situated high on the ramus. Both claws well developed and subequal in L, or anterior slightly shorter than posterior. L ratio between anterior margin of the ramus, anterior claw and posterior claw equalling 1.1:1:1.1. Attachment ( Fig. 8J) simple and long.

Hemipenis ( Fig. 8K): Lobe h higher than a and stout. Internally canals not coiled. Ejaculatory process bifurcated at the distal part.

Description: Female. L of shell 0.6 mm. Greatest H situated behind middle L, equalling 47% of L. Valves not elongated in lateral view ( Fig. 9A, B). Dorsal margin straight in the middle, broadly rounded towards anterior and inclined towards posterior end. Anterior margin rounded, posterior angular ventral margin straight. Surface covered few fine stripes ( Fig. 9C, D) and with sensory setae exiting from pores. Pores rimmed. Surface setae of various lengths. Inner calcified lamellae and line of concrescence narrow ( Fig. 10A, B).

A1 ( Fig. 10D): Five-segmented and similar to previous species. Extension on the posterior margin of the second segment not clearly visible.

(NIBRIV0000243292). All examined material collected from the type locality.

Type locality: River interstitial, Seongdong-ri , Yeongjung-myeon, Pocheon-si, Gyeonggi-do, South Korea, 38°00 ′ 45.9 ″ N 127°14 ′ 47.6 ″ E, elevation 73 m, 5 April 2015, collector Joo-Lae Cho. GoogleMaps

Etymology: The species is named after the Greek mythological character, Andromeda .

Diagnosis: Shell very finely ornamented with few stripes LV and RV subequal. Posterior margin angular. A1 five-segmented; A2 with all three exopodite setae short. L7 with incompletely subdivided penultimate segment. UR with short and stout ramus and with long claws, anterior claw shorter than posterior, claws not distally curved; posterior seta situated medially on the ramus, anterior seta very long (exceeding half the length of anterior claw).

A2 ( Fig. 10B): Four-segmented. Exopod consisting of three short setae. Aesthetasc Y very long. Same segment with two setae on postero-distal margin: one long and other very short. Following segment with two postero-medial and three antero-medial setae. Seta z1 transformed into claw, exceeding distal margin of terminal segment, seta z2 seta like, z3 not observed. Claws G1, G2, G3 and GM all long. Gm claw thin but almost as long as GM. Aesthetasc y3 long.

Md, Mxl, L5 and L6 ( Fig. 10F) same as in previous species.

L7 ( Fig. 10E): Four-segmented. Penultimate segment incompletely subdivided. Basal segment with all three setae present. Only seta ‘g’ present. Terminal segment with two short and one long seta. L ratio between two short setae equalling 2.7:1.

UR ( Fig. 10G): Ramus short, posterior setae situated low on the ramus. Both claws well developed, anterior longer than posterior. Anterior setae long, exceeding middle of anterior claw. L ratio between anterior margin of the ramus, anterior claw and posterior claw equalling 1.1:1:1.2. Genital filed rounded but with bulging distal end.

Male. Not collected.

Remarks: Undulacandona andromeda stands apart from other known species by its angular posterior margin and by a very long anterior seta on the UR.