Latrodectus sp. TINAGAT
(♀, 10 mm)
Discovered: 21 August 2015
Location: Forest reserve patch, Tinagat Beach, Tawau Town, Borneo
Discoverer: Spider hobbyist
Provisional name: Latrodectus sp. TINAGAT
Latrodectus Genus
Taxonomic Context
- Family: Theridiidae (commonly known as cobweb or comb-footed spiders)
- Genus: Latrodectus (widow spiders)
The genus Latrodectus comprises over 30 species worldwide, including the infamous Black Widow (Latrodectus mactans) and the Redback (Latrodectus hasselti). They are widely recognized for their globular abdomens, potent neurotoxic venom, and tangled three-dimensional webs.
Comparison and Distinguishing Features
Compared to better-known species such as:
- L. mactans (North America): glossy black with red hourglass.
- L. hasselti (Australia): red dorsal stripe.
- L. geometricus (cosmopolitan): geometric dorsal pattern, lighter brown body.
Latrodectus sp. TINAGAT appears to exhibit:
- A unique dorsal pattern of pale green or silvery speckles on a dark background (not matching known species patterns).
- Orange-red leg segments, not commonly seen in most Latrodectus species.
- The combination of body size, coloration, and patterns suggest it may represent a distinct or localized species, possibly endemic to Borneo.
Phylogenetic Considerations
While molecular data (e.g., COI barcoding, ITS sequencing) would be necessary for confident placement, the morphological features suggest a close affinity with the geometricus-like group, though the coloration and patterning diverge significantly.
Morphological Description
General Size
- Body length: ~10 mm (adult female)
Coloration
- Cephalothorax: Reddish brown, slightly glossy.
- Legs: Distinctly bicolored
- orange-red femora and tibiae, transitioning to darker distal segments.
- Abdomen:
- Dorsal side: Spherical and bulbous, with iridescent or silvery-white speckling over a dark base.
- Ventral side: Shows symmetrical markings, but lacks the classic "hourglass" seen in many Latrodectus.
Eyes
- Eight eyes in two rows typical of theridiids, clustered compactly.
Spinnerets
- Prominent and visible in ventral view.
- Consist of 3 pairs (as in most spiders), used for producing sticky silk for web structure and prey capture.
Ecological and Behavioral Insights
Habitat Preferences
- Collected from a coastal forest reserve patch, suggesting a preference for moist, sheltered environments possibly with minimal human disturbance.
- Constructs webs in low vegetation, as is typical of other Latrodectus.
Hunting Strategies and Prey
- As a member of Theridiidae, this spider is a web-based ambush predator.
- Likely feeds on small arthropods (insects, other spiders) ensnared in its irregular tangle web.
- Uses venom to immobilize prey quickly and then consumes via external digestion.
Web-Building Behavior
- Latrodectus spiders spin irregular, tangled three-dimensional webs.
- The structure typically includes a retreat zone and sticky catching lines that hang near the ground to trap crawling insects.
- Webs may be constructed in low vegetation or ground-level debris, as often seen in tropical habitats.
Interactions
- Little is known about its interactions, but like other Latrodectus, it may exhibit:
- Solitary and territorial behavior.
- Possible sexual cannibalism in mature mating pairs (a trait documented in other species).
- Low tolerance to disturbances, preferring isolated or protected microhabitats.
Summary
Latrodectus sp. TINAGAT exhibits a combination of features not commonly observed in known Latrodectus species: notably its green-speckled abdomen, reddish-orange leg segments, and non-typical ventral markings. These suggest either a highly localized form of an existing species or potentially an undescribed taxon within the genus.
Further investigation using DNA barcoding and broader regional sampling is recommended to confirm its taxonomic status by scientists. Its presence in Borneo adds valuable data to the biogeography of the Latrodectus genus in Southeast Asia.
(For more about neglected living things (including spiders) in Borneo, visit the Facebook page of Claveria Wong)
Latrodectus sp. TINAGAT
(雌性，10毫米)
發現日期： 2015年8月21日
發現地點： 婆羅洲斗湖鎮錫納加海灘森林保護區
發現者： 蜘蛛愛好者
暫定學名： Latrodectus sp. TINAGAT
Latrodectus屬（寡婦蜘蛛屬）
分類學背景
- 科： 姬蛛科（俗稱網蛛或梳足蛛）
- 屬： Latrodectus（寡婦蜘蛛）
Latrodectus屬全球包含30多個物種，包括著名的黑寡婦（Latrodectus mactans）和澳洲紅背蜘蛛（Latrodectus hasselti）。該屬蜘蛛以球狀腹部、強效神經毒液和三維雜亂蛛網著稱。
形態特徵比較
與常見物種比較：
- L. mactans（北美洲）：亮黑色配紅色沙漏紋
- L. hasselti（澳洲）：背部有紅色條紋
- L. geometricus（廣布種）：幾何背紋，淺棕色體軀
Latrodectus sp. TINAGAT的獨特特徵：
- 深色背部布滿淺綠色/銀白色斑點（與已知物種圖案均不同）
- 橙紅色腿節（多數Latrodectus物種罕見）
- 綜合體型與色紋特徵，可能為婆羅洲特有種或地域變異種
系統發育推測
雖需DNA條碼（如COI、ITS序列）進一步確認，但形態特徵顯示其與geometricus類群親緣相近，然體色斑紋存在顯著差異。
形態描述
基本體型
體色特徵
- 頭胸部： 紅棕色，具微光澤
- 步足： 雙色分節
- 橙紅色腿節與脛節，末端漸變深色
- 腹部：
- 背面：球狀隆起，深色底質上布滿虹彩銀白斑點
- 腹面：具對稱紋路，但無典型"沙漏"標記
眼部結構
紡器特徵
- 腹面觀明顯突出
- 三對紡器（蜘蛛典型結構），分泌黏性絲線構築網巢
生態與行為觀察
棲地偏好
- 發現於海岸森林保護區，推測偏好潮濕蔭蔽且人為干擾少的環境
- 與同屬物種相似，於低矮植被結網
捕食策略
- 典型結網伏擊型捕食者
- 可能以昆蟲、其他蜘蛛等小型節肢動物為食
- 以毒液快速麻痺獵物後進行體外消化
結網行為
- 編織不規則三維雜亂網
- 網體包含隱蔽區與近地面黏性捕食線
- 多建構於熱帶地區的低植被或地表殘材間
生物互動
- 可能表現以下行為：
- 獨居且具領域性
- 成熟個體交配時可能出現性食同類現象
- 對干擾耐受性低，偏好隔離微棲地
結論
Latrodectus sp. TINAGAT綜合多項獨特特徵：綠斑腹部、橙紅步足及非典型腹面紋路，顯示其可能為現生物種的極端地域型，或是該屬的未描述新種。
建議後續研究透過DNA條碼鑑定及區域採樣比對確認分類地位。此發現為東南亞Latrodectus屬生物地理學研究提供重要資料。
（更多婆羅洲被忽略的生物研究，請參閱Claveria Wong 的臉書專頁）
Latrodectus sp. TINAGAT
(♀, 10 mm)
Tarikh Penemuan: 21 Ogos 2015
Lokasi: Kawasan hutan simpan pantai, Pantai Tinagat, Bandar Tawau, Borneo
Penemu: Peminat labah-labah
Nama Sementara: Latrodectus sp. TINAGAT
Genus Latrodectus
Konteks Taksonomi
- Famili: Theridiidae (labah-labah jaring kusut)
- Genus: Latrodectus (labah-labah janda)
Genus Latrodectus mengandungi lebih 30 spesies global termasuk Black Widow (Latrodectus mactans) dan Redback Australia (Latrodectus hasselti). Dikenali dengan abdomen bulat, bisa neurotoksik kuat, dan jaring 3D tidak teratur.
Perbandingan Ciri
Bandingan dengan spesies terkenal:
- L. mactans (Amerika Utara): hitam kilat dengan corak jam pasir merah
- L. hasselti (Australia): jalur merah dorsal
- L. geometricus (kosmopolitan): corak geometri dorsal, badan perang muda
Latrodectus sp. TINAGAT menunjukkan:
- Corak dorsal tompok hijau pucat/keperakan pada latar gelap (berbeza dengan spesies diketahui)
- Ruas kaki merah-jingga (jarang pada kebanyakan Latrodectus)
- Gabungan saiz badan dan warna mencadangkan spesies unik atau endemik Borneo
Hubungan Filogenetik
Data molekul (seperti pengekodan COI) diperlukan untuk pengesahan, tetapi ciri morfologi menunjukkan kaitan rapat dengan kelompok geometricus, walaupun warna dan corak sangat berbeza.
Penerangan Morfologi
Saiz
- Panjang badan: ~10 mm (betina dewasa)
Warna
- Sefalotoraks: Perang kemerahan, sedikit berkilat
- Kaki: Dwiwarna - femur dan tibia merah-jingga, beransur ke segmen distal lebih gelap
- Abdomen:
- Dorsal: Bulat dengan tompok keperakan berkilau pada dasar gelap
- Ventral: Corak simetri, tiada "jam pasir" tipikal
Mata
- Lapan mata dalam dua baris, tersusun padat
Pemintal Sutera
- Ketara dari pandangan ventral
- Tiga pasang (seperti kebanyakan labah-labah)
Ekologi dan Tingkah Laku
Habitat
- Ditemui di kawasan hutan pantai, mencadangkan preferensi untuk persekitaran lembap dan terlindung
- Membina jaring pada tumbuhan rendah
Strategi Memburu
- Pemangsa serang hendap berjaring
- Mungkin memakan artropod kecil
- Melumpuhkan mangsa dengan bisa sebelum pencernaan luar
Pembinaan Jaring
- Jaring tidak teratur 3D
- Struktur termasuk zon perlindungan dan benang pelekat dekat tanah
Interaksi
- Kemungkinan:
- Soliter dan teritorial
- Kanibalisme seks semasa mengawan
- Sensitif terhadap gangguan
Rumusan
Latrodectus sp. TINAGAT mempunyai ciri unik termasuk abdomen bertompok hijau, kaki merah-jingga, dan corak ventral tidak tipikal, mencadangkan sama ada varian lokal atau spesies baharu.
Kajian lanjut menggunakan pengekodan DNA dan pensampelan wilayah diperlukan. Penemuannya menyumbang kepada pemahaman biogeografi genus Latrodectus di Asia Tenggara.
(Maklumat lanjut tentang hidupan terabai Borneo di profil Facebook Claveria Wong)
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