Orphnaecus libmanan Acuña & Guevarra, 2025

Described by Darrell C. Acuña, Leonardo A. Guevarra Jr

♀ Female described ♂ Male described

Female © Acuña et al. (2025), fig. 2D, paratype female, dorsal habitus

Bibliography

Acuña, D. C., Ragasa, L. R. P., Santiago-Bautista, M. R., von Wirth, V. & Guevarra Jr, L. A. (2025). Revisiting and rediscovering the tarantulas (Araneae, Theraphosidae) of Culapnitan (Libmanan) Caves in the Philippines: troglomorphism, taxonomy, phylogeny and ecological niche. Subterranean Biology 52: 143-186.

Distribution

Philippines

Type Locality: PHILIPPINES, Luzon Island, Bicol Peninsula, Camarines Sur Province, Libmanan, Brgy. Sigamot, Libmanan Caves National Park; burrows under and inside rotten logs on a forest slope near Kalangkawan Cave

Adult Male Activity

Collection months of 3 adult male specimen records

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Etymology

The specific epithet is a noun in apposition, named after the type locality, the Municipality of Libmanan in the Province of Camarines Sur, Philippines.

Specimen Records (7)

PNM 18867 (UST-ARC 0133) ♂ Holotype Philippines

Libmanan Caves National Park, Brgy. Sigamot; burrows under and inside rotten logs on a forest slope near Kalangkawan Cave, Camarines Sur

July 2023 · col. L. A. Guevarra, D. C. Acuña & J. D. Fornillos

Holotype male of Orphnaecus libmanan (field no. CSL02-04). Body length 36.02 mm. GenBank COI accessions for the type series: PP778307-PP778312. Note: the type-material section and Fig. 3 caption both give UST-ARC 0133, while the description heading gives UST-ARC 0122; 0133 is followed here.

UST-ARC 0132 ♀ Paratype Philippines

Libmanan Caves National Park, Brgy. Sigamot; burrows under and inside rotten logs on a forest slope near Kalangkawan Cave, Camarines Sur

July 2023 · col. L. A. Guevarra, D. C. Acuña & J. D. Fornillos

Paratype female of Orphnaecus libmanan (field no. CSL02-03).

UST-ARC 0130-0131 ♂ Paratype Philippines

Libmanan Caves National Park, Brgy. Sigamot; burrows under and inside rotten logs on a forest slope near Kalangkawan Cave, Camarines Sur

April 2023 · col. L. A. Guevarra, D. C. Acuña, C. N. Noriega & J. D. Fornillos

Male portion of the paratype lot UST-ARC 0130-0131 of Orphnaecus libmanan (field nos. CSL02-01-02), collected in the April dry season.

PNM 18868 (UST-ARC 0134) ♀ Paratype Philippines

Sitio Guimbal, Brgy. Malinao, Municipality of Libmanan, about 4.5 km from Libmanan Caves National Park; burrow under a limestone rock, Camarines Sur

April 2023 · col. L. A. Guevarra, D. C. Acuña, C. N. Noriega & J. D. Fornillos

Paratype female of Orphnaecus libmanan (field no. CSL04-01), the specimen described in the paper. Body length 40.36 mm.

UST-ARC 0135-0140 ♂ Paratype Philippines

Sitio Guimbal, Brgy. Malinao, Municipality of Libmanan; burrows under piles of coconut husks, Camarines Sur

July 2023 · col. L. A. Guevarra, D. C. Acuña & J. D. Fornillos

Male portion of the paratype lot UST-ARC 0135-0140 of Orphnaecus libmanan (field nos. CSL04-02-07). The spiders occupied the coconut husk piles in the July wet season but were absent from the same piles during the April dry-season sampling.

UST-ARC 0130-0131 ♀ Paratype Philippines

Libmanan Caves National Park, Brgy. Sigamot; burrows under and inside rotten logs on a forest slope near Kalangkawan Cave, Camarines Sur

April 2023 · col. L. A. Guevarra, D. C. Acuña, C. N. Noriega & J. D. Fornillos

Female portion of the paratype lot UST-ARC 0130-0131 of Orphnaecus libmanan (field nos. CSL02-01-02).

UST-ARC 0135-0140 ♀ Paratype Philippines

Sitio Guimbal, Brgy. Malinao, Municipality of Libmanan; burrows under piles of coconut husks, Camarines Sur

July 2023 · col. L. A. Guevarra, D. C. Acuña & J. D. Fornillos

Female portion of the paratype lot UST-ARC 0135-0140 of Orphnaecus libmanan (field nos. CSL04-02-07).