Magnacarina Mendoza, Locht, Kaderka, medina & Pérez-Miles, 2016, gen. nov.
Creators: name: Jorge I. Mendoza
name: Arturo Locht
name: Radan Kaderka
name: Francisco medina
name: Fernando Pérez-Miles
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Theraphosidae
Magnacarina
Magnacarina aldana

description: Magnacarina gen. nov.
urn:lsid:zoobank.org:act:B0477B69- 2908-44 AA-86A6-ACC8C37DCE74
Figs 1–16
Type species
Magnacarina aldana (West, 2000) comb. nov.
Diagnosis
Magnacarina gen. nov. differs from all other known theraphosine genera, except Bonnetina, in having three apophyses on male tibia I and a retrolateral nodule on metatarsus I. Males differ from Bonnetina in having a bifid palpal bulb that possesses a primary and secondary projections.Additionally, Magnacarina gen. nov. differs in possessing a retrolateral nodule of metatarsus I with megaspines, whereas Bonnetina has a granular one. Females differ in possessing a very low semicircular spermatheca with a uterus externus that is longer and wider than the Bonnetina triangular, domiform or digitiform spermatheca. Magnacarina gen. nov. has the following character combination: bifid shape of male palpal bulb with one sperm pore. It has a primary projection, located in the central area of palpal bulb and directed retrolaterally. This projection possesses the prolateral superior and retrolateral keels. The prolateral superior keel is large, extending posteriorly to palpal bulb back face. Posterior extension of the prolateral superior keel may extend to the palpal bulb back face (as in M. aldana comb. nov.), close to border of back face (as in M. primaverensis Mendoza & Locht sp. nov.), or extend only until the middle portion of the palpal bulb prolateral face (as in M. cancer Mendoza & Locht sp. nov. and M. moderata Locht, Mendoza & Medina sp. nov.). Following the primary projection is a secondary projection (long or short), ending with the prolateral inferior and apical keels surrounding the sperm pore. The prolateral inferior keel is always the widest distally. The secondary projection may have prolateral accessory keels that are variable in size and number. Males have a nodule of prolaterally curled megaspines, located at the basal ventroretrolateral region of metatarsi I (except for M. moderata sp. nov.). Male tibiae I with three apophyses. The accessory apophysis well to slightly developed, with apical spines variable in size and number. Urticating setae of the type III arranged in one dorsomedian patch. Females with very low spermatheca and single semicircular receptacle. Uterus externus always longer and wider than spermatheca.
Remarks
Adult males of Magnacarina gen. nov. have a retrolateral nodule of megaspines, located in the retrolaterobasal region of metatarsus I (except M. moderata sp. nov.). This nodule is considered homologous to the granular one found in Bonnetina, so it is possible that these genera are closely related.
Etymology
The genus gender is feminine, comprising magnus, a Latin adjective meaning “very large” or “great”, and the Latin word carina, which means “keel”. Generic name refers to the very large primary projection in the male palpal bulb (Figs 2 D, 6 D, 9 D, 14 D).
Distribution
Magnacarina gen. nov. is endemic to Mexico and only known from the states of Sinaloa, Nayarit and Jalisco. The genus inhabits the deciduous forest along the Pacific coast to the foothills of the Sierra Madre Occidental. Specimens collected during fieldwork were found under rocks, in shallow burrows or superficial scrapes covered with silk.
description: Published as part of Jorge I. Mendoza, Arturo Locht, Radan Kaderka, Francisco medina & Fernando Pérez-Miles, 2016, A new genus of Theraphosid spider from Mexico, with a particular palpal bulb structure (Araneae, Theraphosidae, Theraphosinae), pp. 1-28 in European Journal of Taxonomy 232 on pages 4-7, DOI: 10.5852/ejt.2016.232, http://zenodo.org/record/885395