Ecacanthothrips tenuicornis Okajima

Okajima, Shûji & Masumoto, Masami, 2024, The genus Hoplandrothrips and its relatives (Thysanoptera: Phlaeothripidae) from Southeast Asia and Taiwan, Zootaxa 5489 (1), pp. 22-91 : 32

Ecacanthothrips tenuicornis Okajima

( Figs 15–16 , 120–126 )

Ecacanthothrips tenuicornis Okajima, 1983: 63–65 .

E. tenuicornis was originally described from Luzon Is., the Philippines based on eight females and five males together with non-paratypic three females taken from Mindanao Is. This species could well be included in the inarmatus -group and is somewhat similar to leai , although it has smaller body, 1.8–2.6mm in the female, 1.8–2.2mm in the male. Moreover, the head of tenuicornis ( Figs 120 & 121 ) is shorter, about 1.1 times as long as wide or shorter, although the head of leai ( Figs 93 & 94 ) is longer, usually 1.2–1.4 times as long as wide even in small female. In contrast to inarmatus and moundi , the pronotal anteromarginal setae in this species are not elongate even in large males. Furthermore, tenuicornis is apparently most similar to brevicornis described above, but can be discriminated by the antennal structure mentioned in the key above. However, its intraspecific variation derived from allometric growth is not understood in detail. Females and males listed in the doubtful specimens collected from Peninsular Malaysia and Thailand are very similar to this species, but have somewhat larger bodies, 2.5–2.9mm in female and 2.0– 2.6mm in male.

Specimens examined. The Philippines, holotype female and paratype females and males from Luzon Is.; non-paratypic 3 females from Mindanao Is. (data described in Okajima, 1983).

Doubtful specimens. Peninsular Malaysia, about 20km N from Kuala Lumpur, Templer Park , 2 males, on dead leaves, 15.viii.1990, TN & SO . Thailand, Phuket Is., nr. Tone Sai water fall, 2 females and 5 males, on dead leaves and branches, 11–14, ix.1992, TN & SO ; Phuket Is., Rang Hill , 3 females and 2 males, on dead leaves and branches, 14.ix.1992, TN & SO; nr , Chiang Mai, foot of Doi Pui , on dead leaves and branches, 3 males, 1.ix.1991, 1 male, 24.viii.1992, TN & SO ; Chiang Mai, farm of Chiang Mai University , 1 female and 3 males, on dead leaves and branches, 26.viii.1992, TN & SO .

Figures

FIGURES 15–28. Ecacanthothrips and Hoplandrothrips species. E. tenuicornis 15–16: (15) female; (16) large male. E. tibialis 17–18: (17) female; (18) large male. H. adraneoides sp. n. 19–20: (19) female; (20) large male. H. aseanae sp. n. 21–23: (21) female; (22) small male; (23) large male. H. asianus sp. n. 24–25: (24) female; (25) male. H. basantratus sp. n. 26–27: (26) female; (27) large male. H. flavicornis sp. n.: (28) female.

FIGURES 120–126. Ecacanthothrips tenuicornis. (120) Head and prothorax, female; (121) head and prothorax, large male; (122) antennal segments III–V, female; (123) antennal segments VI–VIII, female; (124) metanotum and pelta, female; (125) prosternum and mesopresternum, female; (126) tube, female.

FIGURES 93–101. Ecacanthothrips leai. (93) Head and prothorax, female; (94) head and prothorax, large male; (95) antenna, female; (96) antennal segments III–IV, female; (97) metanotum and pelta, female; (98) metanotum and pelta, male; (99) prosternum and mesopresternum, male; (100) tube, female; (101) sub-basal wing setae, female.