Sunday, September 26, 2021

[Arachnida • 2021] Yunohamella varietas • A New Spider of the Genus Yunohamella (Araneae: Theridiidae) from Korea

Yunohamella varietas
Lee & Kim, 2021

Yunohamella varietas sp. n., from Ulsan Metropolitan City, Korea is newly described based on the male. The new species is closely related to Yunohamella lyrica (Walckenaer, 1841) and Yunohamella serpatusa (Guan and Zhu in Zhu et al., 1993), but can be distinguished from Y. lyrica and Y. serpatusa by the dorsal pattern of the abdomen, shape of embolus, conductor and median apophysis. The new species was collected with a sweep net in rice fields.

Keywords: description, Korea, Theridiidae, Yunohamella varietas sp. n.
Yunohamella varietas sp. n., male holotype.
A, Body (habitus in specimen), dorsal view; B, eye region, from above; C, chelicera (left), retrolateral view; D, sternum; E, palp (left), prolateral view; F, ditto, ventral view; G, ditto, retrolateral view; H, ditto, dorsal view
(C, conductor; E, embolus; Ma, median apophysis; Sd, sperm duct; St, subtegulum; T, tegulum). Scale bars in mm.

Family Theridiidae Sundevall, 1833 

Genus Yunohamella Yoshida, 2007 

Yunohamella varietas sp. n. 

Diagnosis. The new species is similar to Y. lyrica and Y. serpatusa with important diagnostic characters of the genus in the genital structure such as the shape of embolus, conductor, median apophysis of the palpal organ in morphology. The new species with dorsal spots with a cardiac pattern on the abdomen, embolus long and slightly curved, thick and long beak-like conductor, peach-like median apophysis (Fig. 3F), but can be easily distinguished from Y. lyrica with a distinct dorsal stripe on the abdomen, embolus medium and straight, long and flame-like conductor with a twisted tip, angular median apophysis (Fig. 4A) (Levi 1957: 89, figs 322, 323; Yoshida 1987: 13, figs 1, 2; Namkung 2002: 96, figs 13, 14b) and from Y. serpatusa with a distinct dorsal stripe on the abdomen, embolus short and straight, broad and long spatula-like conductor, round median apophysis (Fig. 4B) (Zhu et al. 1993: 92, figs 14–17; Marusik and Logunov 2017: 92, figs 35–39).

Etymology. The species name is derived from the Latin noun ‘varietas’ meaning mottled appearance, referring to the black and whitely mottled pattern on dorsum of the abdomen. 

Sue Yeon Lee and Seung Tae Kim. 2021. A New Spider of the Genus Yunohamella (Araneae: Theridiidae) from Korea.  Species Diversity. 26(2); 165-169. DOI:  10.12782/specdiv.26.165